A surefire way to know you're getting a tan? Snap a mirror selfie before you lay out in the sun.
Kylie Jenner did exactly that on June 29, posting a photo to her Instagram with the caption, "Tan twime":
Jenner shared another bikini photo with her 9.6 million Instagram followers June 28. She appears to be in the same navy swimsuit top, this time sporting a pair of circular shades:
The 16-year-old reality star is clearly spending her summer working ... on her tan, that is.